Mock Implementation
Get activities request using mock implementation.
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Content Manager mock implementation
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Content manager mock implementation
Merge remote-tracking branch 'upstream/master'

Conflicts:
	api/src/main/java/org/craftercms/studio/api/asset/AssetManager.java
Merge refactored code;
Mock implementations;
Asset Service added